Telephone system



Jan. 15, 1929. 1,699,457

' F. TENQH TELEPHONE sYs'rEu u ormm Filled Sept. 23:, 192s 4 sheets-sheet 1 un nu nu Ra Ly L4 92?-2/ Jan. l5, 41929. 1,699,457

F. TENcH TELEPHONE SYS TEM Original Fi huren D1"- Frank T51-lah Jan. l5, 1929. 1,699,457

F. TENCH TELEPHONE SYSTEM 'Original Filed 1'.. 23,v

Jam.V 15, 1929. 1,699,457

y F. 'rENcH TELEPHONE SYSTEI Filed Sept. 23, 1925 4 Sheets-Sheet 4 Patented Jan. 15, `1,929D

tlhllTD STATES k1,699,457 PATENT oFFicE.

FRANK TENUE, OF LONDON, ENGLAND, ASSIGNOR, BY MESE ASSIGNMENTS, T0 AUTO- MATIC ELECTRIC INC., OF CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE.

TELEPHONE SYSTEM.v

Application inea september 23, 1925, serial No. 58,001, and in Great Britain January si 1925. Renewed April 26, 192,8".

The present invention relates to telephone systems and is more particularly concerned with novel applications of automatic switches in circuit arrangements which perrangements are particularly suitable for use in connection with register translators and such use will be considered in the description which is to follow. The improvement in the utility of the switches may be obtained by arranging for the switch vto be used twice where previously it was only used once or by arranging for it to perform one operation by virtue of its setting and a further operation on its return to a normal position or also by arranging for the switch to make one or more auxiliary steps after its original setting.

According to one feature of the invention an automatic switch is provided in which the wipers are adaptedto be connected up successively to control different operations and in which the switch is arranged to be advanced to a new position in between erent operations sofas to enable one wiper to be used twice for two different purposes.

according to another feature of the invention in an automatic switch adapted to hunt automatically under the control of' one or more wipers, after the termination of a limiting movement the switch is adapted to talre a predetermined number of additional steps whereupon the wipers previously used for controlling the hunting movement are.

brought into engagement with contacts over whi an operation other than hunting is I controlled.

Anofl er' feature of the invention relates to a register sender adapted to vregister wani'eil numbers and to send out trains of impulses in accordance therewith in whichl one or more of the register switches employed are adapted to be released in a plurality of stages betweenl two of which impulses adapted to be sent out.

A further feature of the invention is that in a resister' translator adapted to register* 'wat numbers and to send out trains The chief object impulses vin accordance therewith, a register switch is adapted to be used to record a plurality of digits in the called number, control. in accordance with one of said digits being effected while the wiper of the switch is stationaryy in the position to which it has been set, while control in accordance with another digit is effected by vthe subsequent movement ofthe switch after it has vbeen set to register this digit.

Still another' feature of the invention is that in a register sender adapted to' register wanted numbers and to send out trains of impulses in accordance therewith, the operating magnets of the register switcheswhich record the designation of theA wanted party control contacts in the circuit for sending out impulses, the'contacts of each magnet being rendered ineffective until they are required to send out impulses.

These and other features of the invention not specifically mentioned at this point will :be better understood from the following deerably thev switches are ofthe single-level type having 25 contacts in the bank and moving always in the same direction; such switches are already yextensively employed for connecting a calling subscriber with a first numerical switch or the like. One advantage ofv having the yswitches of the register translator off an exclusively rotary'type is that it allows a more compact assembly and reduces maintenance costs.

The advantage of using the register switches f ii"effecting the generation kof impulses i's that it distributes the work more evenly and tends to give all the switches an' equal life. Previously in systems of this character where a 'single impulse control switch controlsV the sending of all `the trains of impulses, it has been found'trtt this switch becomes worn out camp rati-rely soon, as it is rotating almost continuously.. The use ot lthe register switches for sending impulses involves in the arrangement about to be described a translation ot the number dialled into its complement with respect to,

in this case 11. rlhis arrangement, however, need not present any serious difficulty as it is not a matter which affects the subscriber in any way and trunlring may be carried outy and Bellamy, Serial No. 6955042, tiled February 25, 1924i.

Referring now to the accompanying drawings comprising Figs. 1, 2, 3 and 4L, these show one example of carrying the invention into practice, although it will be, of course,

understood that various modiiications might be made to the circuits without departing from the spirit of the'invention.

Fig. 1 shows a subscribers station A, the associated line switch C, and the trunlr circuit TG with which is associated the first selector D and the register selector DS.

Figs. 2, 3 and el; represent the registertranslator, the switches of which it will be noted are all single-level switches ot the type which move in. one direction only. In the example about to be described they are all 25 point switches ci' the type generally used for connecting the calling subscribei"s line to a first numerical switch and are mechanically identical with the switch C.

rl'he portion. of the register translator shown in Fig. 2 comprises4 the in-put control switch ICS which has four banks and the digit registers M1, M2, M3 and M4, of which M1' has three banks, M ?and M3 have two banhs each, and M'1 has one bank. The reasons for the difference in the numbers et banks oic these various register switches will appear in due course.

Fig. 3 shows one of the code switches Cr ot which -four are assumed to be provided in the present system which comprises a neth work having` about or 8() exchanges. Only one ot these code switches is shown, however, in order to prevent the drawing becoming unduly complicated, since the circuits of the others are precisely similar and the method of their operation will, be at once apparent to those skilled in the art.

Fig. 4 shows the output control switch OCS and the impulse control switch 1S. This latter it will be seen from the iioliow? ing description is only used for cimtrolling the sending of the impulses corresponding to the exchange code, the control .of the impulses comprising the numerical digits being effected by the digit registers M4', M1, M2 and M3 onl returning to their normal position.

In order that the operation et the apparatus may be traced through in detail, assume that the subscriber at A wishes to call the subscriber whose number is Avenue 3456 and that the calling subscriber A accordingly dials the number 283-6456, 282 being the numerical equivalent ot the irst three letters AVE of the exchange name which is converted by the translator into the digits 916. W'hen the subscriber at A removes his receiver, a circuit is completed over the line conductors 11 and 12 and armatures 17 and 19 and vtheirback contacts for line relay 15. Relay 15, upon energizing, at armature 23 completes a circuit iior switching relay 14 and rotary magnet 16 in series and at armature 241 connects test wiper 21 to the junction ot switches lay 14 and rotary magnet 16. At armature 23 moreover earth is connected to private normal conductor 18 vin order to make' the line of substation A busy in the banlrs ot the connectors having accessthereto. The line switch C now ycommences to huntl in known manner and it will be assumed that the tiret idle trunk encountered is that shown en theV drawings comprising the trunk circuit and the associated selector D and selector DS. Since the wiper 2l does not now find earth,relay 14C is no longer short circuited .and energizes in series with niagnet 16 which is not new energized, hovmvcr, owing to the high resistance of relay 14.-. Relay 14; at armature 18 completes aflorle ing circuit for itscll and at armature 17 and 19 connect-s the speaking conductors through, whereupon a circuit is completed for line relay 31 of the trunk circuit over the subscribcrs loop and arinaturcs`39 and 11 and their back contacts. Relay 31, upon energizing, at armatiue 35 primaries a circuit for relay 33 and at armature 2# pletes a circuit tor slow relal 32. Y Relay 32, upon energizing, at armature 86 cruinects earth to release trunl; conductor betere it has been removed at 235 so as to maintain relay let oper` f at arinaime 37 completes a circuit for switching relay 81 and magnet S2 of the reo'ster s j DS in seriesand at armature 38 connects ,ica

test wiper 89 to the junction ot relay 81 and magnet S2. The switch DS now 'commences to hunt for a free register translator in the same manner as did the switch C, and it will be assumed that the first one tound idle is that shown in Figs. 2, and e io comwhich access is had over conductors 91, 92, 93, 94. When the wipers oi' DS reach the position shown, Since thev registerv translator is assumed toy be idle, relay 81 i is no longer short circuited and enero' thereupon at armatures 83 and94 pr n ing the outgoing impulsingl circuit, at t ture 86 closing another point in the circui ol "wlay and armature disconnecting st wiper 89 trom the above mentioned circuit', and connecting toit direct earth. Upon the operation of armatures 83 and a circuit is completed Ylor line the selector D which extends as follows: earth, lower winding of relay 51, back contact andV armature 71, conductor 44, :normally closed springs controlled by zii-mat are 41, armature and its 'iront contact, wiper 88, conductor 92, multiplied contacts 1 to 6 in the bank oli wiper 300 of the switch OCS, armatures 801 and 302 and their-'back contacts in parallel, lead 91, wiper 6T, front contact and armature 63, normally closed springs controlled' by armature 39, conductor 42, armature 68 and its ba fcontact, upper winding of relay 51 to batt'. y. Re lay 51 operates in this circuit and at its armature 62 completes a circuit for slow release relay 52 which also energizes so th the switch is prepared for operation ne usual manner. The connection of earth to conductor 93 has the effect of energi' relays and k101, whereupon resto i circuits for the various switches are opened so that it may be possible for these switches to remain in an oil normal position.

rlhe register translator' now in condition to receive the impulses transmitted by the calling subscriber and with the assum1 tion made above the first 4series comprises two impulses. lil'hen this is dialled, line relay 31 ot the trunk circuit TC is momentarily deenergized twice and each time a circuit is completed as Vfollows: earth, back contact and armature 35, arn'iature 86 and front Contact, wiper 90, conductor 94, winding of relay 112, wiper 120er' the input control switch ICS and its Ylroi'it contact, winding of magnet 121 to battery. Relay 112 and magnet 121 encrf e in series in this circuit and the iormer at arinati'lre 114 c inpietes circuit for relay At the end of each impulse, magnet 121 deenergizes and advances the wipers 124, 1253, and 126 ot the first digit register M] one step so that they are moved into engage ment with the second contact in their respective banks. Relay112 is made slow to release in order that it shall hold up throughout the train of impulses and on their termination releases alter a short interval and armature 114 completed a circuit over armature and its front contact for the magnet 127 of the switch ECS,

This circuit remains closed until relay 1131 relay 51 ot of the switch. ICS deenergizes aller a short interval, and on vthe release oi magnet 127, wipers 120, 99, 140 and 141 are moved on one step so as to direct the impulses representing the second digit to the register M2.

The subscriber will now dial the next digit in the wanted number which is assumed to be 8, and accordingly eight impulses are transmitted over lead 94 by the operation of armature 35 and are extended over wiper 'and the second contact in its bank to magnet 131 of the second digit register M2. This, therefore, advances its wipers 129 and 130 intov engagement with the ninth Contact in their respective banks. Relay 112 is enen gized as before and eifects the energizaton of relay 113, these Vtwo relays then serving toadvance the wipers of the switch ICS a further step on the termination of this series of impulses.

The succeeding digit, in this case 3, is transmittedy in a similar manner, but since wiper 120 `is now in engagement with the third contact in its bank, the impulses are transmitted to the magnet 134 of thethird digit register M3, and this accordingly advances its wipers 142 land 143 into engagement with the fourth contacts in their respective banks. The input control switch CS is moved on a further step at theend ot this series of impulses in amanner similar to that previously described and is then in a position to route theiirst numerical digit to the digit register M4.

The three digits corresponding to the exchange name have now been registered and hence it is determined to which exchange theY call isto be routed. It is, therefore, now

possible for the sending of the train oit` imonly started up when the first digit ot thev exchange name is'2 or 3, `the secondA in response to a lirst digit which is 4 or 5, the third in response to 6er 7, and the fourth in response to 8 or 9. It maybe mentioned. in passing that one is not used as the/lirst digit of an exchange naine owing to the pos sibilityot' confusion with a false impulse, while Ovis used for obtaining access to an operator as will subsequently be described. The discrimination necessary for starting up the right switch is 'eiiected over the wiper 126 of the .first digit register Ml in a manner which will now be described` As soon as the wiper 141 of the switch ICSengages the fourth contact 144 in its bank, a circuit is completed as follows: earth, Contact 144, wiper 141, armature 145 and its back contact, wiper 126, lead 146, armature 214 and its back contact, interrupter contact 207, winding of magnet 206 to battery. The code switch CS is therefore started hunting and this operation continues until the above circuit is broken at armature 214 upon the operation of shunt field relay 208. When the switch ICS advanced to its fourth position a circuit was also completed from earth, contact 144, wiper 141, armature 145 and its back contact to wiper 125, which it will be remembered is standing on its third contact. Earth is thus connected to lead 175 and battery is connected over back Contact and armature 163, lead 164, wiper 130 and the ninth contact of its bank to lead 176, and also earth is connected from wiper 143 over the fourth contact in its bank to lead 177. As may beseen from y2 these leads are connected by way of leads 225, 226 and 227 to contacts 228, 229 and 230, respectively, in the banks of wipers 200, 201 and 202. Consequently, if it is assumed that these wipers were originally standing in the position shown in Figure 2, it will only be necessary for them to make one step before they encounter the contacts which have been marked owing to the operation of the digit registers M1, M2 and M3. Hence when the switch has taken this step, shunt field relay 208 is energized and at armature 214 opens the circuit for magnet 206 and at armatures 209, 213 and 215 connects up the wipers 203, 204.I and 205 vof the switch CS. Relay 208, moreover, at armature 216 prepares a locking circuit for itself, at armatures 211 and 212 prepares circuits which will be described sub# sequently, and at armature 210 connects earth to lead 174 thereby completing a circuit for relay 150. Relay 150, upon operating, at armature 145 opens its initial energizing circuit and locks itself up to lead 147, at the same time disconnecting earth from wipers 125 and 126 so as to prevent the possibility of any other code switches being started up subsequently, or any other shunt field relay operating. Alt armatures 153, 154., 155, circuits arev completed for restoring the digit registers M1, M2, M to normal., the circuit in the case of the register 1W extending as follows: earth from the multiple contacts in the bank of wiper 124 and said wiper, front contact and `rmaure 153, back contact and armature 159, interrupter contact 122, winding of magnet 121 to battery. The wipers 124, 125 and 126 are thus rotated forwards until wiper 124 -engages contact 179 which is not earthed so that the above circuit is broken. It will be noted that at this timel earth is connected 'to contact 178 by way of armature 152, back Y contact and armaturer 158 and lead 167 so that wiper 124 does lnot stop on this contact. The circuits for the registers M2 and M3 are similar and need not be tracedin detail. Relay 150 moreover at armature 156 prepares a circuit for relay 151 and at armature 157 connects earth to lead 180.l This earth has the effect of energizing relay 231 which thereupon by operating its armatures 232, 233 and 234 completes locking circuits forthe shunt field relay 208, so that this will not deenergize when its original'circuit is opened by the return of the wipers 125, 130 and 143 to normal. rEhe earth on lead 180 also extends to the first Contact in the bank of wiper 306 of the output control switch OCS, and over the wiper by way of the interrupter I and armature 322 and its back contact, wiper 305, first Contact in its` bank, armature 331 and its back contact, winding of magnet 317 of the impulse control switch 18 to battery. rEhe interrupter l is preferably power driven at such a speed as to produce interruptions at the rate of approximately 10 per second. vAt this time an earth connection is extended by way of wiper 304 and its lirst contact, lead 330, front contact and armature 215, wiper 205, and the second contact in its bank, terminal 235 on the right hand side of the intermediate distributing frame, hereafter referred to as the I. D. F., .jumper to terminal 9 on the left hand. side ofthe 1. D. 1T., lead 236, to the eleventh contact in thebank of wiper 326. W hen the interrupter I next closes its contact-s, magnet 317 is energized and when subsequently the circuit is opened by the interrupter I, magnet 317 deenergizes and advances the wipers 325 and 326 one step, whereupon a circuit is completed from the multiple earthed contacts in the bank of wiper 325 for relay 308. Relay 308 upon energizing, at its armature 301 removes one of the multiple connections across the impulsing leads 91 and 92, at armature 309 prepares a circuit for relay 312, at armature 310 opens a point lin the circuit of magnet 323 of the output control switch OCS and at armature 311 prepares a locking circuit for the two-step relay 327, which will not be required, however, at this stage. Owing to the continued operation of the interrupt-er, magnet 317 is again energized in due course and at its armature 302 opens a point in the circuit of line relay 51 of the selector D, which circuit it will be remembered extends from lead 92 over wiper 300 of the switch OCS and through armature 302 and its back contact to lead 91; consequently one impulse is transmitted to the selector D and it operates to raise its wipers one step in the well known manner. In response to theifurther operation of the interrupter 1, the wipers 325 and 326 are advanced step-bystep and 326 reaches this contact a circuit is ,com-` pleted for the stop relay 312, 4which upon4 energizing, armature 313 completes arestoring circuit for magnet 317 by way Of interruptercoiitact 313, whereupon wipers 325 and 326 are advanced until wiper 325 reaches a contact which is not earthed. Relay 312 moreover at armature 314 places a shunt.

around armature 302 so that subsequent operations oit this armature while the switch IS is returning toviiormal shall not ksend impulses to the selector D, at armature 315 completes a locking circuit for itself, atar.- inature 316 prepares a circuit for vmagnet 323, and at armateur-e331 opens the/circuit from interruptor' I to the magnet 317..v It will be appreciated that when relay 312 is thus operated, 9 interruptions will have been sent over the loop circuit, and consequently the selector D will have been raised to the ninth level. The hunting operation of this selector -will then be initiated and a'succeeding switch will be taken into use and prepared for operation iii the usual manner; this hunting operation takes place while the switch IS is .restoring to normal.A As soon wiper 325 tails to find earth, the circuit is no longer completed for relay 308 and it therefore deenergizes after a short interval owing to its slow to release characteristic.

The dcenergization of relay 308 completes the circuit for magnet 323 and opens` the locking circuit of relay 312. Relay" 312,

therefore, deenergizes after a short interval` and at armature 316 opens the circuit of magnet 323, whereupon the wipers 299, 200, 303, a, 305, 306 of the switch GCS are advanced one step and at armature 331 again completes 'the circuit for magnet `317 so that the sending oi' the next digit may commence.

This next digitvinthe present case is one which is determined by the Afact that the' connection from the second Contact `in the bank of wiper 30d is made toterminal 1 on the lett hand side of the` I. D. F. Consequently the 'next train of impulses sent outA for reaching the desired Avenue exchange consists of one impulse only and as soon as wiper 326 reaches its third contact, to which lead 233 is connected, the sending of impulses is stopped and the switch IS is ref turned automatically toits norma-l position in the manner previously described.

Upon the subsequent release of relay 312, magnet 323 is deenergized andthe switch ICS advanced a further step. Earth is non iectcd over wiper 304C and its third coi i cad 332, front contact and armature 209. n 203 and the second Contactin its bank, terminal 239, jumper to terminal 6 on thewleft hand side ofthe I. D. F., lead 2416',

to the eighth contact in the bank ot wiper 326. Assoon as armature 331 again engages its back Contact, impulses are again t-raniinitted to magnet 317 and a train ot impulses comprising in this case siX impulses, is sent over conductors 91 and'92 forgoperating the switches for extending the peaking connection. It will be noticed that the loop circuit which is interrupted to operate these switches remains tor the present the same as that pre viously traced owing to the i'act that the iirst six contactsin the bank of wiper 300 are multiplied'together. y It is assumed' that to obtain access to the Avenue exchange in which tliecalled partys line terminates re-' quires only threetrains of iinpulsesso that the wipers 203, 20e', and 205 of the ycode switch are sufiicient toV deal with the situation and consequently it is not necessary `for the switch CS to take an additional step to bring into use the wipers 200,201, 202 tor impulse controlling purposes. AThus yall the impulses required toselect the wanted exchange have vnow been sent and transmission of the lnumerical digits may take place immediately.r

To return ,for a moment to the consideration of 'the operations which take place at the registers' M1, M2, M3 and M4 during the regstration of the numerical digits, it has already been explained Ythat the first numerical `digit is registered on the switch M4 in a similar manner tothe operation of the registers already described. The .description was previously taken to the point at` which relay 150 had been energized and the switch M1, M3 andM-q thus had circuits completed for restoring them to their normal positions. It may beA considered that the time required Ali'or the Vsubscriber to dial the first numerical digit togetherwith the pauses before and after such digit will be ample for the code switch concerned to complete its yoperation and for the registers'Ml, M2 and `M3to1be restored to normal. Hence by the time the first impulse o' the second numerical Adigit is received, register M1, M2 and. M3 will be back at normal. 4In the present case this digit is 4f and.v four learth impulses will theretore be sent over lead 94, The circuit now extends through relay 112 toY wiper 120 and over its litth contact tomagnet 121 so thatthe digit 4: is set up on the register M1. At

the same time a circuit is completed. over wiper 'and front contact and armature 156, normally closed springsl controlled by armature 162 for relay 151. This, therefore, operates; `at armature 153 removes earth from lead 16'.7 so that when restoring circuits are subsequently completed for the switches M1, M2, M3 and M* the wipers will be arrested when they encounter contacts connected to this lead; at armatures 159, 160 and v161 .opens the restoring lcircuits' previously closed so as to permit the wipers to take up an ofil normal position; at armature 162 completes a locking circuit for itself and at armature 163 removes ybattery from wiper 130 so as to prevent the possibility of the shunt held relay associated with any other code switch energizing in case the wipers of that switch should be resting' on contacts connected to the contacts on which the Considering now the further operation of the output control switch OCS after the third exchange selecting digit has been sent, wipers 299, 300, 303, 304i, 305 and 30are advanced into fourth position in the usual manner whereupon a circuit may be traced as follows: earth, armature 212 and its front contact, lead 333, fourth contact in the bank of wiper 303 and d wiper, inter,- rupter contact 324C, magnet 323 to battery. The wipers of the switch GCS are thus advanced a further step whereupona similar circuit is completed, in this instance over armature 211 and its front contact, lead 334-, and the fifth contact in the bank of wiper 303 so that the wipers are advanced to sixth position. In this position a circuit is coinpleted from earth by way of back Contact and armature 223, chain of similar contacts indicated at 237 on the relays such as 217 associated with the'other code switches to the sixth contact in the bank of wiper 303 so that theY switch OCS is advanced to se enth position. as follows: earth, wiper 304, seventh con tact in its bank, winding of relay 319 to battery. Relay 319 thereupon operates; at armature 320 prepares an alternative circuit for relay 308, at armature 321 prepares a circuit'for relay 312 and at armature 322 prepares acircuit for the two-step relay 327. Moreover, owing to the fact that wiper 300 has now larrived at its seventh contact, interrupter contact 139 is now included in the outgoing impulsing circuit over leads 91 and 92. Since wiper 131 of the switch MA1 is now resting` on its fourth contact a circuit is completed as follows: earth, fourth contact in the bank of wiper 181 and said wiper, conductor 182, seventh contact in the bank of wiper 306 and said wiper, front contact and armature 320, winding of relay 308 to battery. Relay 308, therefore, operates and at armature 301 opens the shunt around armature 302 which 1s, however, without ef- A circuit is now completed feet inl this case since armature 302 will not now be operated; at armature 309 completes the circuit for relay 312; at armature 310 opens a point in the circuit of magnet'323 and at armature 311prepares a locking cir,- cuit for relay 327. Relay 312 now energiaes and operates'armatures 313, 314, 315, and 331 as before but in this case without effect, and at armature 310 prepares a circuit for mag net 323. A branch of the above traced ycircuit from wiper 181 of switch Mt extends by way of the interruptor l, armature 322 and-its front contact, armature 328 and its back contact, upper winding olf-relay 327 to battery. Consequently when interrupter I next closes its contacts, relay 32.7 will be partially energized and will operate its light armature 329, thereby connecting earth to the other terminal of its lower winding so that' for the present this'winding is short circuited. When the interrupter Y contacts open again, relay 327 yenergizes fully .over both windings in'series and operates its armature 328, whereupon the circuit from the interrupter is extended to wiper 305 Vand over the seventh contact in itsV bank.. lead l171, win-ding. of `magnet137 to battery.

Hence, it will appreciated that as the inten rupter continues to rotate, impulses will be sent to magnet 137 so-as to operate wiper 181 andr this `will continue until the wiper reaches its twelfth contact which is connected to lead 167; since this lead is not earthed at this time there is no further operating earth for magnet 137 and the switch comes to rest.` Moreover, owing to thisremoval of earth, relay 308 is deenergized andrreleases, thereby at armature 309 opening the circuit of relay 312, at armature 310 completing a circuit for magnet 323 and at armature 311 opening the locking circuit for relay 327 which therefore deenergizes. Relay 312 also deenergizes after the interval for which it is adjusted and by releasing armature 313 effects the deenergization of magnet 323 so that the wipers of the switch OCS are dvanced a further step.

It will bel seen that on each operation of the magnet 137A of the register M4' the out` going loop including conductor 119 was in,- terrupted at the contact 139 so that since the switch wiper 181 was originally on the fourth contact and was advanced to the twelfth Contact, eight impulses were sent.l As will be appreciated more clearly from the subsequent description, the numerical digits are not sent out exactly as received from the calling subscriber but instead a number of impulses is sent representing the difference between the number of impulses dialled and eleven so that the value of the train of impulses sent out may be considered as complementary to the value of the series dialled. f v

l/Vhen magnet'` 323 deenergizes the switch OCS is advanced to its eighth position and a circuit may then be traced as follows: earth, fifth contact in the bank of wiper 12a and said wiper, lead 183, eighth contact lin the bank of wiper 306 and said wiper, front contact and armature 320, winding of relay 308 to battery and in parallel thereto over interruptor l, armature 322 and its front contact, armature 328`and its back contact and upper winding of relay 327l to battery. Relay 308 now operates with the previously described results while two-stepv relay 327 also operates partially as before and when fully energized transfers the above earth by way of armature 328 and itsA front contact to wiper 305 and the eighth contact in its bank, lead 168, winding of magnet 121 to battery. It will be realized that the function of the relay'327 is to guard against an imperfect iirstimpulse being sent in case the switch OCS should be moved on while the contacts of the interrupter I are closed. The sending of the series of impulses corresponding to the second numerical digit now continues in a manner similar to that previously described, the loop cirl` cuit in this case extending from conductor 91, back contact andV armature 302, and armature 314s and its front contact in parallel,

wiper 300 and the eighth Contact in its bank,

lead 118, back Contactr and armature 123, back contact and armature 13,9 to lead 92. ln this case it 1s impossible for magnet 137 to be again energized atthis time so that the control is entirely byl armature 123. Hence seven impulses are sent over the outgoing trunk line while wiper 124 is advancing until it reaches the dead contact, which is connected to lead 167.

The sending of the remaining series of impulses which willcompriseand 5 impulses, respectively, now proceeds under the control of registers M2 and M3 in a manner which will be readily followed.A In the former case, earth is obtained over lead 1841- and after the operation of relay 327 is eX tended to magnet 131'over lead 169, While interrupter contact1133 is included in the impulsing circuitk by way of lead 117.' For the last digit earth extends from the bank of wiper 1a2rover lead 185 and is fed tor magnet 134 over lead 170 and owing to the advance of wiper 300 contact 13G gener# ates impulses ina circuit including` lead 116. On the termination of the transmission of the last series of impulses, the output control switch is moved on in the usual manner into its eleventh position and a circuit may then be tracedl as follows: earth,

wiper 3011 and its eleventh contact, lead 172` eighth contact in the bank of wiper120 and said wiper, relay 112, lead 911, wiper 90, front contact and armature 86, armature and its front contact, Vwinding of relay `33 to battery. Relay 33 thereupon operates; at

normal.

armature 4&0 completes a locking circuit for itself to release trunk conductor 413 and at armatures 39 and L11 connects the speakingk nects earth to lead 167 `whereupon circuits are completed for advancing the digit registers M1, M2, M3 and M* to their normal po-V sitions. l n

These circuits will be seen to extend over armatures 108, 10d, 109, 105 and their back contacts, and interrui,iterA contacts 122, 13.'

Sii

135 and 138 to magnets 121, 131, 134i and 132i,`

respectively. vliloreover, at armatures r102 and 103 and over leads 1418 and 149 and` also over armature 111 and lead 173 circuits are. completed for restoring the switch 'GCS 'to normal. Armature 107 completes a circuit for restoring the switch l5 to normal, this circuit, however, being ineffective in the present instance vsince this switch is already at At armature 108 a circuit is con;- pletedr which extends to magnet 127 by way of wiper 1410 and interruptor Contact 128 and serves to restore the switch lCS to normal. These circuit-s arev more particularly provided to deal with the case in which the register translator isnot comple'ely operated, owing,

for instance, to the subscriber hanging up his f receiver after having dialled only a portion The code switch CS and theV similar code switches which are not shownr the number.

are adapted to remain on the contacts last used and hence they make no movement when the register translator is released. The relays 150 Vand 151 are locking circuits for openedwhen wiper lellreaches its normal position and the release of relay 150 opens the circuit for relay 231 This accordingly releases and, opens the locking circuit for the'shunt held relay 208. rl`he circuit for `relay 319 was opened asA soon as wiper 301 moved into its eleventh position so that this .relay is deenergzed before the switching through operation takes place. rlhus alltl'ie apparatus employed has been restored lto normal and the register translator maybe used for setting up other connections.

The case will now be considered in which the subscriber A wishes to call a subscriber whose number isv Barkingl 341-58 in conse-4 quence of which he will dial BAR 31156, auf'. it will be assumed that with the lettering of the dial employed BAR corresponds to 22?.

is also 2 will be routed to 'the It will further be assumed that Barking is located at some distance from 'the originating exchange, and that in consequence it is necessary to send tive trains of impulses in order to selectv the Barking exchange, the code digits being 94152.

In order to initiate the call the subscriber will remove his receiver' in the usual manner, and it will be assumed that his line switch C thereupon again seizes the trunk circuit shown in Fig'. 1 and that the register selec` tor DS then commences to operate, and again seizes the register translator shown in Figs. 2, 3 and 4. 1n response to the dialling of the first digit 2, two impulses` will be sent by way of slow relay 112 and over wiper 120 to magnet 121of the first digiiJ register M1 which will, therefore, be advanced two steps as in the case previously considered. The input control switch ICS will then advance one step so that the next dig" maj which in its of the second digit register lil' vturn will be advanced two steps. In a similai' manner the third digit which is 7 will be transmitted to the magnet 134 of the third digit register M3 which will accordingly be advanced seven steps. On the con-- pletion of this series of impulses the switch ICS will be advanced a further step and a circuit will then be completed over wiper 141 for starting the hunting of the code switch CS which will again be used since the first exchange digit is 2. The contacts which are now marked in the banks of the switch CS are contacts 240, 241 and 242, the circuits to which may be traced as follows: earth is connected from wiper 141 at contact 144, armature 145 and its back contact, wiper 125, third contact in its bank, lead 175, lead 225 to contact 240. Battery is connected by way of back Contact and armature 103, lead 154, wiper 130 and the third contact in its bank, lead 186, lead 243 to contact 241. llarth is also extended over wiper 143 and the eighth contact in its bank, lead 187, lead 244 to Contact 242. The switch CS therefore hunts to find these contacts in the manner previouslydescribed, and when they are reached, the shunt i'ield relay 203 is energized over the circuits traced and oper tes as before to open the hunting circuit, to prepare a Alocking circuit for itself, to connect up the wipers 203, 204, 205 of the code switch and to energize relay 150. The energization of relay 150 completes a circuit for relay 231 which completes locking circuits for relay 203 and a circuit is also completed for restoring the switches M1, M2 and M3 to normal in readiness for receiving the second, third and fourth numerical digits. In the meantime the first numerical digit 3 is being stored on the register M4' and the transmission of the exchange selecting impulses will these registers to remain in an oli' normal position. Y

Consider now the transmission of the impulses necessary for selecting the Barking exchange. lWhen earth is connected to llead 180, it is extended as before over the multipled contacts in the bank of wiper 306 and the said wiper, interruptor l, armature 322Y and it backcontact to wiper 305, multipled contacts in its bank, armature 331 and its back contact, magnet 317 to battery. In this case theearth stopping the operation of the sending switchwhen the required number of impulses have been sent out extends from wiper 304 over lead 330, front contact and armature 215, wiper 205, terminal 245, jumper to terminal 9 on the'left hand side of the l, D. F. and thence to the contact in the bank of wiper 3.16 which correspends to the transmissiony of nine impulses. lWhen this Contact is reached, the stop relay 312 is energized over wiper 326 and the circuit just traced and operates tok shuntkthe interrupter armature 302, to effectv the re-Y turn oi the switch 1S to normal, to complete a locking circuit for itself, to prepare a circuit for magnet 323 .and to cut oti' the interrupter l. When the switch 1S reaches normal position the circuit of relay 303 is opened andit deenergizes thereby openingthe circuit of relay 312 which deenergizes also. After the lapse of the interval represented by the release time of these two slow relays, the circuit of magnet 317 is again intermittently closed. 'Wiper' 304 1s now in engagement with its second Contact, and consequently earth is extended by way of front contact and armature 213 to wiper 204 and thence by way of termin al 4 on the left hand side of the 1. l). F. tothe corresponding contact in the bank of wiper 320; thus four impulses are sent for the second exchange selecting digit. W hen the wipers of the switch GCS are now'moi/ed on a further step, the following circuit is completed: earth 304, third contact in its bank, lead 332, front contact and armature 209, wiper 203, contact 246, normally closed springs controlled by armature 221, winding of relay 217 to battery. Relay 217 operates and at armature 221', extends a branch of this circuit through the interrupter contact 20T( and winding of magnet 206 to battery. Magnet 206 therefore energizes ,andv operates its interrupter contact', thereupon opening its circuit, so that it then d'eenergizes and advances the wipers` 200-205, inclusive, one stepA Since the circuit over contact ,246 is now broken, it is not possible for any furhave commenced. As in the case previouf'- ther operation of magnet 206 to take place.

At armature 221 relay 217 completes a lock' ing circuit for itself to earth on wiper 141 by way of lead 147, and at armatures 218, 219 and 220 disconnects wipers 220, 201 and 202, respectively, from the winding of the shunt lfield relay and connects them to leads 249, 248 and 247 which extend to the sixth, lifth and fourth contact in the bank of wiper 304,'respectively. Relay 217 also at armature 222 and its front contact shunts 'armature 209, at armature 223 removes earth from lead 250 for a purpose which willv appear subsequently, andk at armature 224 opens the locking circuit for the shunt field relay 208. Relay 208 vtherefore deenergizes and at armatures 211 and 212 removes earth from leads 334 and 333 and at armature 214 again closes a point in the hunting circuit for magnet 206. It is not now possible, however, for this circuit to be closed owing to the fact that even lsupposing wiper 126 should come to rest on either itsv third or fourth contact, which may not be the case,

earth is disconnected from wiper 125 at armature 145. Owing to the advance of the wipers of the code switch one step, the earth which served to operate relay 217 is now extended over contact 251 to terminal 1 on the left hand side of the I. D. F., which determines that'the next train of vimpulses sent out .shall comprise one impulse only. Three trains of impulses have now kbeen sent out as in the connection previously described, but in this case as there are still two more to be sent, the output control switch must not run through its fourth, fifth and sixth positions, as it will be necessary for it to control the transmission of impulses in itsfourth and `fifth positions. The switch OCS is prevented from advancing too rapidly in 'this case owing to the fact that earth has been removed from lead 333 at armature -212 owing to the kdeenergization of relay 208. In the `'fourth position of switch OCS, earth is extended from wiper` 304 andthe fourth contact inits bank over lead 247, front contact and armature 220, wiper 202, contact 252, terminal 5 on the left hand side of the I. D. F. 'to the corresponding` contact in the bank of wiper 326, so that it is thus determined thatthe next train of impulses shall comprise 5. After this train has been completed, thewipers of the output control switch OCS are moved on in the usual manner and earth is then extended over lead 248 and 'front contact land armature 219 to wiper 201 and thence lover contact 253 to terminal 2 on the left hand side of the I. D. F. so that the next impulse train comprises two impulses. lVhen this is linished wiper 304 advances one step and then extends earth over lead 249, front contact and armature 218, wiper 200, contact 254, terminal 255 on the right hand side of the I. D. F., terminal 256 on the left hand side ofthe I. D. F. to conductor 250 extending to the sixth contact in the bank of wiper 303 and said wiper, interrupt/er contact 324, magnet 323 to battery. Thus earth which is removed from the sixth contact in the bank of wiper 303 by the operation of armature y'223 is now replaced at the proper time in order to cause the switch to advance through this position.

The exchange digits have now beendisposed of and the sending of the numerical digits will proceed in precisely the same manner as has previously been described. On the succeeding step of the switch OCS, relay 319 isenergized and serves to change over the circuits associated with relays 308 andv 312, lso that these relays shall work in conjunction with the registers M4, M1, M2 and M3 rather than with the switch IS. In

each case the proper digit register advances until its upper `wiper engages the contact connected to lead 167, each step of this return motion serving to send an impulse to the corresponding switch for extending 'the speaking connection, whereby as previously explained, the number of impulses sent is the complement of the number dialled b y the calling-subscriber. lhen all the numerical digits have been sent the output'con#y trol switch is moved into its eleventh position and an impulse then comes back over lead 172 and wiper 120 of the switch ICS in eighth position, and thus serves to operate switching relay 33 in the trunk circuit TC. ,Thereupon the circuit lof rrelay 31 is opened, and subsequently that of relay 32,- and the deenergization of the latter relay opens 'the circuit for relay 81, whereupon the switch DS is' restored to its normal condi-tion, and .the release of the register ytranslator is initiated by the removal of earth from lead 93. This release proceeds in a manner precisely similar to that `previously described, relay 217 being unlocked when wiper 141 passes off its multipled contacts during the vreturn of the switch ICS to normal.

` In order that the working of the invention may be fully understood, one further case of a connection set up by the subscriber at sub-station A will be briefly considered, Suppose in this case that the wanted number is Forest 3456 and that the numerical equivalent of the irst three letters FOR of the exchange name is 307. Assume further that the Forest exchange is also situated at some distance from the originating. ex,

change or is perhaps a satellite exchange and consequently that six exchange code digits are necessary in order to obtain access to it; thus the digits 307 dialled by the calling party may be translated into the digits 730413. f n f For convenience in description it will be taken that the initial operations of setting up the connection take place in the manner previously described, that is to say, the subscribers line switch G takes into use the trunk circuit TC of Fig. 1, and the register selector DS associated therewith again takes into use the register 'translator shown in Figs. 2, Band t. rlhe dialling of the lirst of the exchange digits 3 by the calling subscriber results in three earth impulses being sent over lead 94,- and through relay 112 over wiper 120 to magnet 121 of the first digit register M1.

In a similar manner the second digit 0 is recorded on the register M2 and the third digit 7 onk the register M3. TWhen the switch ICS now steps to its fourth position a circuit is again completed for the code switch GS shown in figure 3, since, as previously pointed out, this switch is enabled to deal with all exchanges for which the first digit is 2or 3, that is to say, with the assumed lettering of the dial, those in which the first letter of the exchange name is A, B, C, D, E or F.

A study of the connections in Figs. 2 and 3 will show that the contacts which are now marked in the banks of the wipers 200, 201 and 202 of the switch CS are the contact-s 256, 257 and 258. Consequently when the switch CS reaches this position, the shunt field relay 20S is energized as before and operates with the previously described results, which includethe energization of relay 150. The registers M1, M2 and M3 are thus returned to normal, and owing to the con nection of earth to lead 180 by relay 150, the sending of impulses is initiated in the usual manner.

The determination of the value of the first series of impulses 'is effected by the earth connection by way of ,wiperA 304 and its first contact over lead 330, front contact and armature 215, wiper 205, contact 259 to terminal 7 on the left-hand side of the I. D. F., and thence to the corresponding contact in the bank of wiper 326. Sending of impulses is eii'ected by means of armature 302 in the usual way, and when the marked contact is engaged by wiper 326 relay 312 energizes to terminate the impulse train. Switch OCS is subsequently moved on one step and the second di git is then sent out, the determination' of its Value being effected over a circuit including wiper 201i which may readily be traced. Upon the termination of this series of impulses, the switch UCS again steps and a circuit is completed in the manner previlously described for relay 217 and also for magnet 205. The code switch CS is thus advanced one step and relay 217 energizes with the vpreviously described results. Wipers 202 201 and 200 are now brought into use successively to control the sending of the fourth, fifth andI sixth digits in the exchange code and the switch OCS is subsequently advanced to its seventh position.

scribed in response to the switching impulse Y sent from wiper 304 over leans 17 2 and 9A.

lt will now be desirable to consider the function and operation of wiper 99 of the switch ICS and wiper 299 of the switch GCS, the contacts in the banks of these wipers being multipled together in va particular manner. These wipers are provided to take care of the case in which the subscriber is dialling in a slow or irregular manner, so that the register translator, in spite of having to wait for all the exchange digits before it starts sending, is likely to catch up with the subscriber. In cases of this sort it has sometimes been arranged that after the register translator has sent out all the digits received by it it is released and subsequentV digits dialled by the subscriber operate the switches direct. One objection to this arrangement is that the switches may not always receive impulses of exactly standard character from the subscribers dial while the impulses sent from the register transla- -tor can readily be adjusted to be standard. Another difficulty arises in thepresent case because the numerical digits are not sent out from the register translator exactly as reico l ceived, but are so to speak inverted. A further point that requires attention is that since in this case impulses are generated by contacts on the magnets of the register switches and these contacts are short-cir cuited until the proper time by wiper 300 of switch OCS, it is essential that this switch OCS shall not move intov the next sending position before the corresponding digit has been completely received, otherwise there will be a chance of false impulses being sent out prematurely lwhile the register switch is recording the digit. By wayof example, suppose a subscriber wanting Forest 34:56 pauses after he has dialled FR-B; in thiscase the number of digits sent in will be four and therefore switch lCS will be in position 5 and wiper 99 will be resting on contact 18S. When the sender has sent out the six exchange selecting digits and has started sending the thousands digit, the switch GCS will' be in seventh position., After the sending of the thousands digit is inished when relay 308 deenergizes and opens the circuit of relay 312 at armature 309, relay 812 does not deenergize if the subscrih er still delays because a circuit is new completed from earth, wiper 99, contact 188, lead 189, seventh contact in the bank of wiper 299 and said wiper, winding of relay 312 to battery; hence relay 3l2remains energized' and at armature 316y maintains the circuit of magnet 323 so that. the switch CCS cannot advance. Suppose now that the subscriber resumes his dialling, the digit 4 will be recordedon the register M1 and on its termination wiper 99 will: be advanced from the fifth to the sixth position. The circuit of relay 312 is thereupon opened and it deenergizes and permits CCS to advance to eighth position in: which position the' sending of the digit 4, which will be converted to 7 then takes place. Similar circuits are adapted to be completed as may be readily traced in cases where there are-pauses between other digits. Itis, of course, undesirable that the circuit ofmagnet 323 should remain closed an undue length of time, and this will be taken.y careof by arrangements of known type whichare therefore not shown. for releasing the register translator and giving the subscriber the busy tone incase he makes ay pausey of. excessive length between digits.

It has become usual practice in automatic telephone systems to arrange that when the subscriber. requires the-services of an opera tor hedials the digit 0 only.- The effect vof this on the register translator of the present inventionfis that when-the switch ICS steps to its second position on the-termination of this digit,.a circuit is .completed from battery, second. contact inthe bank of wiper 141, armature-145 and-its back contact, wiper 125, lead 190, winding of relay 260 to earth. No armatures-have been shown on rela-y 260 but it4 will be-understood that this isarranged to, make. suitable connections to effect the sendingf out of' the series of impulses necessary to route the call to the opera-tors position. Arrangementswill also be included for switching over and releasing the register translator as soon as the required-impulses lhave been sent withoutwaiting-forthe switch OCS to reach its eleventh position in. which switching normally takes place.

It shouldI be mentioned that arrangements will preferably be made for preventing the register translator being taken into use while any of the various switches are in an olf normal 'position, but sincesuch arrangements are bynow wel-l known they have not been. shown in this instance. Similarly in order to. avoid unduly complicating the drawing, full wiring of the banks on the switch CS has not been shown, but only sufficient to give a clear idea of the principle on which it is done.

It should be mentioned also that in order to avoid unnecessary rotation ofthe various switches, theICS has been provided with three normal positions, andthe switches M1, M2, M3., M4, OCSland.- IS with two. For

the sake of convenience, however, .it has been assumed throughout the description when referring to contacts that the'switch Starts from the position shown in the drawings. Clearly, if it were thought desirable, it could be arranged that the switches M1, M2, M3, which in the ordinary course respond to two digits, were always returned to the position shown when t-he register translator was not in use. v

Another point which it is desirable to mention is that since wiper 300 of the switchy OCS is connected in the outgoing pulsing circuit, it is essential that this wiper shall not break contact in moving from one position yto the Vnext, otherwise false impulses would be sent out over the loop and the switches would be wrongly set. It will also be appreciated that though in the arrangement sho-wn the switch CS moves on-the additional step after it has controlled thesending of two digits, it would equally well be arranged to move at any other suitable time, for instance before any digits had been sent atall. Furthermore, if in` some particular instance it should be desirable to send more than six code digits, it would be possiblek for the wipers such as 204 and 205 to control the transmission of series of impulses before taking the eXtra step and also after it as well.

W'hat is claimed is:

1. In a director, a y translator switch, wipers for positioning said switch, a sender, and means for altering the circuits of said switch after the same is positionedto enable the said4 wipers to be used for controlling said sender.

2. In a. director, digit registers for registering digits of a called number, a translator switch, means for operating said switch to a certain position depending on the particular digits registered, means for thereafter operating said switch to a. new position, and a. sender controlled by said switch in its new position to send out digits.

3. In a director, digit registers for registering digits of a called number', a translator switch, means for operating said` switch to a certain position depending on the particular digits registered,` means for thereafter operating said 'switch a. predetermined additional extent, and a sender controlled by said switch in both positions to send out digits. i

4. In a director, digit registers for registering digits o-f a called number, a translator switch having wipers, means for starting the operation of said switch, means controlled by said wipers for stopping saidswitch in a certain position Adepending on the particular digits registered, means for then moving said wipers an additional eX- tent, and a sender controlled by said wipers in their new position to send out digits.

5. In a. director, digit registers for registering digits of a called number, a translator switch having test wipers and digit control wipers, means for starting the operation of said switch, means controlled by said test wipers `tor stopping said switch in a cortan position depending on the particular digits registered, a sender controlled by said digit control wipers to send out a plurality of digita means for then advancing the switch to a new position, and means whereby said sender is then controlled by said test wipers in their new position to send out other digits. I

6. In a. director', digit registers tor registering digits ot a called number, a translator switch having test wipers, digit control wipers, and another wiper, means for starting the operation of said switch, means controlled by' said test wipers 'for stopping said switch in a certain posit-ion depending on the particular digits registered, a sender controlled by said digit control wipers to send out a plurality of digits, means controlled by said other wiper for advancing the switch to a new7 position, and means whereby the sender is then controlled by said test wipers and said other wiper to send out other digits.

7. In a director, digit registers, means for registering the first part of a called number` on said registers, a translator switch, means 'for operating said switch in accordance with the digit combination registered, means i'or thereafter' restoring said registers to normal, said first means then functioning to register the last part of a called number' on said registers, a sender controlledby said switch to send a plurality of digits, means lor causing said restoring means to again restore said registers to normal, and means controlled by said registers while the same 'are restoring to normal the Vsecond time for sending out another plurality of digits.

8. In a director, digit registers, means for registering the first part of a called number on said registers, for then restoring said registers to normal, and Jfor then registering another part of the called number thereon, an impulsing circuit, a sender, means for causing said senders to send impulses over said circuit in accordance with the first setting of said registers, and separate sending means for each register for sending impulses over said circuit in accordance with the second setting of the associated register.

9. In a director, digit registers, means for registering a series of digits on said registers, 'for then restoring said registers to normal, for then registering a second series of digits thereon, and for then restoring said registers to normal a second time, a sender, means 'for causing said sender to send impulses in accordance with the first setting of said digit registers, and means controlled by said-registers in restoring to normal the second time for sending other impulses.

10. In a director, digit registers, means for registering digits of a called number on said registers, a plurality ot translators, means controlled by one of said registers for selecting a particular one 'oi said translators depending on the digit registered thereon, means controlled jointly by said registers for operating the selected translator in-accordance with the digit co nbination registered, and a sender for sensing digits in accordance with the setting of the selected translator.

il. In a telephone system, a register for registering digits ot a called number, a translator' switch having a wiper, means including said wiper for positioning 1 said switch in accordance with digits registered on said register, means controlled by said wiper for repositioning said switch under certain conditions, and a sender for: sending digits controlled by said wiper in the first portion of the switch providing the switch is not repositioned, and controlled by said wiper in the second position of the switch providing the switch is repositioned.

12. In a telephone system, a translator switch having test wipers and digit control wipers, means including said test wipers for positioning said wipers in accordance with a called number', a sender controlled by said digit control wipers to send out digits, means controlled by one of said digit control wipers in case the number of digits to be sent out is greater than the number of digit control wipers for moving said ywipers to a new position, and means forthen placing said sender under the control of said test wipers to cause the sender to send other digits.

'13. registering apparatus arranged to be set in In combination, a translator switch,

accordance with a plurality of characters in a number, means for positioning said switch subsequent to the said setting ot said registering apparatus and in accordance with the setting of said registering apparatus, means for thereafter moving said switch an additional extent, and a sender controlled by said switch in its final position.

lli. In combination, a translator switch, registering apparatus, means for operating said apparatus to register afplurality of characters in a number,y means for subsequently positioning said switch in Aaccordance with the setting of said apparatus, means for thereafter moving said switchan additional extent, and a sender controlled by said switch in both positions.

l5. In a telephone system, a translator switch having wipers, means for starting the movement of said wipers, means controlled by said wipers when they reach a position corresponding to a called number for stopping the movement of said wipers, means for then causing said wipers to be moved an additional extent, and a sender controlled by said wipers in their second position.

16. In a telephone system, a translator switch, means for initially positioning said switch in accordance with a called number, a sender controlled by said switch in its initial position to send digits, means operative after a certain number of digits have been sent for repositioning` said switch to a new position, said sender being thereafter controlled by said switch in its second position to send other digits.

17. In a telephone system, a digit register comprising a wiper and a motor magnet, means for operating said magnet to position said wiper in accordance with a digit, a circuit interrupter, a control switch having two wipers and a two-step relay, the first control switch wiper being normally connected to said relay in series with said interrupter, means for operating said control switch wipers to connect with said register wiper and said motor magnet, respectively, to cause said two-step relay to operate to its first step when the circuit is closed by said interrupter, and to operate to its second step. when said circuit is again opened by said interrupter, and means controlled by said two-step relay when it is operated n its second step for closing a circuit including said register wiper, the iirst control switch wiper, said interrupter, said second switch wiper, and said motor magnet in series to cause said digit register to restore said register wiper to normal.

In witness whereof, I hereunto subscribe my name this'lst day of August, kA. D. 40

FRANK TENCH. 

